AMERITRON AL-572, Instruction Manual

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Ameritron AL-572 Instruction Manual
16
T
RANSFORMER
C
ONNECTIONS
The power transformer can be adjusted for various power line voltages by changing a group of
jumper wires located near the outside edge side of the large power supply circuit board. These
jumpers are located above the power transformer and have letters and numbers plainly marked on
the circuit board. The jumper connection points are labeled A through F and 1 through 3.
120 volt operation will normally be adequate in most situations. Operating this amplifier on 240
volts may be advantageous if the 120 volt power mains have abnormally high resistive loss. 240
volt operation is advisable when house lights dim or "blink" during operation or if the amplifier's
HV drops below 2500 volts at full output.
For maximum safety, never operate this amplifier on
mains that use fuses or circuit breakers rated above 25 amperes on 120 volts, or 15 amperes
on 240 volts.
The power transformer of the AL-572 has fourteen different voltages available on the primary
and is rated at full power on frequencies of 50 and 60 Hz. The jumper connections chart below
indicates the proper placement of jumpers for various power line voltages.
The high voltage secondary of the AL-572 has three leads. The normal wiring is indicated on the
circuit board silk-screen by the initials R/Y (RED/YELLOW) and R/G (RED/GREEN). For low
power operation the R/Y and R/G wire can be reversed. This will reduce the plate voltage of the
AL-572 to permit operation at output levels below 400 watts.
WARNING: The AL-572 requires different back panel fuses for
various line voltages. Use the fuse listed in the
jumper connections chart for maximum protection.
JUMPER FROM TOP LETTERS
TO BOTTOM LETTERS IN COLUMN
HIGHEST
LINE-V A B C D E F
LINE
FUSE
205 C B 3 1 12
215 C B 3 2 12
220 C B 2 1 12
230 C B F E
10
240‡ C B 1 2 10
245 C B 2 3 10
250 C B 1 3 8
90 B A D C 3 1 25
100 B A D C 3 2 25
110 B A D C 2 1 25
115 B A D C F E 20
125† B A D C 1 2 20
130 B A D C 2 3 20
140 B A D C 1 3 15
†Factory wired Model AL-572 and AL-572Y
‡Factory wired Model AL-572X